<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS-边框属性</title>
    <style>
        .box1{
            width: 200px;
            height: 200px;
            background-color: pink;
            margin: 0 auto;
            /* border-radius: 50px; */
            /* 圆形 */
            border-radius: 50%;
        }
        .box2{
            width: 500px;
            height: 200px;
            background-color: blanchedalmond;
            /* 操场跑道形状 */
            margin: 0 auto;border-radius: 100px;
        }
        .box3{
            width: 200px;
            height: 200px;
            background-color: greenyellow;
            margin: 0 auto;
            box-shadow: 10px 10px 20px yellowgreen;
        }
    </style>
</head>
<body>
    <div class="box1"></div>
    <div class="box2"></div>
    <div class="box3"></div>
</body>
</html>